HSS 2111 Lecture Notes - Lecture 10: Pectoralis Major Muscle, Clavicle, Triceps Brachii Muscle
16 Mar 2017
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Document Summary
Functions of the hand grip three features: Stable foundation provided by carpals (anchors metacarpals: metacarpals, passive or actively adjusted, a transverse arch (provides a positon for the phalanges. Phalanges converge towards a central point btwn thumb and fingers (if object is larger, group in the palm: arch able to be passively moved, so phalanges can move along parallel pathways to grip cylindrical or cuboidal shapes. The metacarpalphalangeal joints allow for great movement; ~ 90 degrees flexion, 20 degrees hyperextension. Extensor carpi radialis longus and brevis, flexor carpi radialis, flexor carpi ulnaris, and externsor carpi ulnaris radial and ulnar deviation, extension and flexion of wrist. Functions of shoulder glenohumoral (gh) joint has two components primary purpose of the movement and synergistic positioning of the segments to allow more efficient performance of the primary purpose: most movements at ac joint. If sternal end depresses, acromial end will elevate; if sternal end protracts, acromial end retracts.
